Water-tube boiler.



L. STEINMLLBR. WATER TUBE BOILBR. APPLICATION FILED PBB.28, 1910.

1,026,532.L v l Patented My 14,191.2.-

3 SHEETS-SHEET 1.

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L. STBINM'LLER.

WATER TUBE BOILER.

APPLICATION FILED PBB.2B, 1910.l

1,026,532. v Patented May 14,1912.

3 SHEETS-SHEET 2.

coguMmA PLANOORAPH co.. WASHINGTON. n. c.

' L. sTBI/NMLLER.

WATER TUBE BOILEB.

APPLIO ATION FILED FEB.28, 1910.

1,026,532. Patented Mayi14, 1912.

3 SHEETS-SHEET 3.

LEBRECHT STEINMLLER, OF GUlVIlVIERSBACI-I, GERMANY.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented May 14, 1912.

Application led February 28, 1910. Serial No. 546,303.

To all whom t may concern.'

Be it known that I, LEBRECHT STEIN- MLLER, a subject of the King of Prussia, and resident of Gummersbach, in the Province of the Rhine, Germany, have invented certain new and useful Improvements in Tater-Tube Boilers, of which the following is a specification.

This invention relates to that type of water-tube boilers, in which a horizont-ally inclined tube-element, connected to an upper water drum or drums is combined with one or more vertical tube-elements, which are inclosed in flues.

A novel feature of the present invention consists in the provision of a free space or chamber partially bounded by the vertical tubes, below the fire-grate and ash-pit which space and the vertical tubes are so arranged and dimensioned that the said vertical tubes may be removed and inserted through said space or chamber. The vertical tubes may be arranged on either side of said horizontally inclined tube-element.

A combined vertical and inclined tubeboiler according to the present invention has the further important advantage that the superheater may be very conveniently arranged in the pass of the furnace gases from the inclined to the vertical tube-element. It is possible with this arrangement to employ comparatively large superheating surface without using any extra space, because owing to the arrangement there is necessarily a space formed between the inclined tubes and their upper water drum. The superheater may be of sector form and arranged to surround a part of one of the upper water drums. With this arrangement the superheater tubes may be very easily extracted and inserted, which is of course a point of very considerable importance.

In order that the invention may be clearly understood reference will now be made to the accompanying drawings.

In the drawings Figure 1 represents a combined inclined and vertical tube boiler -according to the present invention and is a section on the line A-B-C--D of Fig. 2. The vertical tubes are arranged at the sides of the sloping tubes and are inclosed within separate draft-ways. Fig. 2 is a section on the line E-F-G-H of Fig. 1. Fig. 3 is a cross-section corresponding to 1 and illustrates a further modified form of a combined boiler according to the present invention. In carrying the invention into effect according to the form shown in Figs. 1 and 2 the main upper drum 1 is connected directly or indirectly with the front header 2 of the inclined tube bank 3 while the rear header 4; is connected by the connection or downcomer pipe 5 with the main drum 1. Side drums 6 are arranged on one or both sides of the main drum 1, a bank 7 of vertical watertubes connects the upper side drums 6 with the lower drums 9. The connection of the main upper drum 1 with the side upper drums 6 is effected by means of pipes 8. Below the grate 10 there is arranged an ashpit 11 and below the flooring of this ash-pit there is arranged a space or chamber 12, bounded on the sides by the vertical tubeelements 7. The chamber 12 is separated from the furnace-gases passed through the vertical tube-element 7 by movable walls 13. This chamber 12 and the vertical tubes 7 are so arranged and dimensioned that said vertical tubes 7 may be introduced into this chamber after the removal of the walls 13. The introduction of new tubes into the space 12 and the removal of old tubes from the space 12 into the boiler-room may be effected through openings 1li arranged in front of the grate. The arrangement of the tube-changing-space 12 below the lire-grate and within the space taken up by the boiler has some very important advantages. There is no extra space necessary on top of the boiler for the removal of the vertical tubes; hence the arrangement of the piping of the boiler is not hindered by allowances for the removal of the vertical tubes. The vertical tubes need not be removed through the side walls of the boiler, therefore the boilers may be arranged side by side without any gangway between them. The radiation from the boilers is less and a battery of boilers takes up less space owing to the absence of gangways and to the thinner walls between the boilers. Between the inclined tube -section 3 and the vertical tube sections 7 the superheater l5 is arranged. This arrangement has the advantage that the otherwise unused space between the inclined tubes 3 and the upper drum 1 is put to a useful purpose and that a very considerable heating surface may be arranged in this space. The gases rising from the grate 10 first pass over the inclined tubes 3 and then over the superheater 15 to pass through openings 16 of the side falls 17; which close in the furnace space. The gases then pass through the vertical tube-elements 7 in three passes a 6 u,-

as can be seen in the bottom part of Fig. 2. In Fig. 2 it will also be seen that the rear part of the grate may be very easily inspected through a spy-hole 58 while access to the grate itself may be obtained through the man-hole 59. The side vertical tube sections may be arranged to close in the whole of the inclined tubes or they may be arranged to project rearwardly or forwardly for any desired amount.

The upper and lower water drums may be formed as round drums G or flat chambers GG, as shown in Fig. 3. These arrangements are all known and are merely diagrammatically illustrated to illustrate their application to a combined boiler according to the present invention. The superheater also may be modified in various ways. The furnace gases passing from the inclined tube section to the vertical tube sections may be guided in various ways, for instance the gases may be arranged to pass in the entire breadth or length of the boiler through the vertical tube-element 7 instead of in the manner illustrated in Fig. 2. Also the relative-arrangement of the vertical tube-elements with regard to the upper drums may be modified in various ways.

In the construct-ions suggested the vertical tube sections may be arranged on one side only of the inclined tube-element. One side of the boiler is thereby left open for the furnace which may be arranged crosswise in regard to the upper drum.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention here` in described and all. statements of the scope of the invention, which as a matter of language, might be said to fall therebetween.

I claim:

l. In a water-tube boiler the combination of a furnace, a horizontally inclined tube element arranged within said furnace, so as to be exposed to the hottestl gases, a set of vertical tubes arranged on both sides o1' said tube-element and a separate flue for inclosing each of said sets.

2. In a water-tube boiler the combination of a furnace, a horizontally inclined tubeelement arranged within said furnace, so as to be exposed to the hottest gases, an upper and a lower water chamber for said element connected to an upper longitudinal water drum, and a set of vertical tubes arranged on each side of said tube-element, a separate `flue for inclosing each of said sets, an upper and a lower water chamber for each of said sets and means for connect-ing the upper water chamber of each set with the upper water drum.

3. In a water-tube boiler the combination of a furnace, a horizontally inclined tubeelement arranged wit-hin said furnace, so as to be exposed to the hottest gases, vertical tubes arranged on both sides of said tubeelement, and divided longitudinally of the boiler into a plurality of sets, separate lues for inclosing the said vertical tubes, division walls in said flues, adapted to permit the gases to How in `paths parallel to said tubes through successive sets, and separate upper and lower water spaces for said sets of tubes.

4. In a water-tube boiler the combination of a furnace, lire-bars in said furnace, a horizont-ally inclined tube-element, arranged within said furnace so as to be exposed to the hottest gases, a set of vertical tubes arranged on both sides of said tube-element and extending below the level of said firebars, a flue for inclosing each of said sets of tubes and a removable portion at the bottom of the inner side of each of said flues, forming two walls of a chamber below said firebars, and adapted topermit the removal of said tubes thro-ugh said chamber.

5. In a water-tube boiler the combination of a furnace, a horizontally inclined tubeelement within said furnace, so as to be eX- posed to the hottest gases, a superheater located above said element and exposed to the gases after these have passed the said tubeelement, separate flues leading from said furnace to both sides of said tube-element, and vertical tubes arranged within said flues so as to be exposed to gases of the next lower temperature.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

LEBRECHT STEINMI'ILLER. `Witnesse E. S. BILLIG, MAX FELfrsoI-L Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D.V C.

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